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DRV102 Datasheet(PDF) 8 Page - Texas Instruments |
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DRV102 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 23 page DRV102 8 SBVS009A www.ti.com BASIC OPERATION The DRV102 is a high-side, bipolar power switch employ- ing a pulse-width modulated (PWM) output for driving electromechanical and thermal devices. Its design is opti- mized for two types of applications: a two-state driver (open/close) for loads such as solenoids and actuators, and a linear driver for valves, positioners, heaters, and lamps. Its wide supply range, adjustable delay to PWM mode, and adjustable duty cycle make it suitable for a wide range of applications. Figure 1 shows the basic circuit connections to operate the DRV102. A 0.1 µF bypass capacitor is shown connected to the power supply pin. The Input (pin 1) is compatible with standard TTL levels. Input voltages between +2.2V and +5.5V turn the device output on, while pulling the pin low (0V to +1.2V), shuts the DRV102 output off. Input current is typically 80 µA. Delay Adjust (pin 2) and Duty Cycle Adjust (pin 3) allow external adjustment of the PWM output signal. The Delay Adjust pin can be left floating for minimum delay to PWM mode (typically 15 µs) or a capacitor can be used to set the delay time. Duty cycle of the PWM output can be controlled by a resistor, analog voltage, or D/A converter. Figure 1b provides an example timing diagram with the Delay Adjust FIGURE 1. Basic Circuit Connections and Timing Diagram. pin connected to 0.1 µF and duty cycle set for 25%. See the “Delay Adjust” and “Duty Cycle Adjust” text for equations and further explanation. Ground (pin 4) is electrically connected to the package tab. This pin must be connected to system ground for the DRV102 to function. This serves as the DRV102 reference ground. The load (solenoid, valve, etc.) is connected between the output (pin 6) and ground. For an inductive load, an external flyback diode (D1 in Figure 1a) across the output is required. The diode serves to maintain the hold force during PWM operation. Depending on the application, the flyback diode should be placed near the DRV102 or close to the solenoid (see “Flyback Diode” text). The device’s internal clamp diode, connected between the output and ground, should not be used to carry load current. When driving inductive loads, an additional diode in series with the out pin, D2, is required (see “Series Diode” text). The Flag (pin 7) provides fault status for under-current, over-current, and thermal shutdown conditions. This pin is active low with pin voltage typically +0.2V during a fault condition. A small value capacitor may be needed between Flag and ground for noisy applications. RPWM CD Delay Adjust Input (TTL-Compatible) On Off Thermal Shutdown Over/Under Current Flag DRV102 Load Duty Cycle Adjust VS 24kHz Oscillator PWM 23 1 7 6 Out 5 VS 4 Gnd (Gnd electrically connected to tab) Delay tP tON OUTPUT VS 0 INPUT +2.2V to +5.5V 0V to +1.2V Duty Cycle = = 25% tON tP RPWM = 90.9kΩ tON ≈ 10.4µs tP ≈ 41.6µs (1/24kHz) 1a). Basic Circuit Connections CD = 0.1µF (92ms constant dc output before PWM) RPWM = 90.9kΩ 1b). Simplified Timing Diagram (1) D1 D2 CD = 0.1µF 92ms • • • • • • Initial dc Output (set by value of CD) PWM Mode (resistor or voltage controlled) NOTE: (1) External flyback diode required for inductive loads to conduct load current during the off cycle. Flyback diode shown near DRV102. For some applications with remotely located load, it may be desirable to place the diode near the solenoid—see “Flyback Diode” text. Motorola MSRS1100T3 (1A, 100V) or MBRS360T3 (3A, 60V). 0.1 µF (+8V to +60V) |
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